The primary purpose of a pressure relief valve is protection of life and property by venting fluid from an over pressurized vessel. Information contained in this handbook applies to the...
Foxboro intelligent positioner SRD991 is designed to operate pneumatic valve actuators and can be operated from
control systems (e.g. the Foxboro I/A Series System), controllers or PC-based configuration- and operational tools
such as PC20 / IFDC or PC50 (FDT Software). The positioner is available with different communication protocols.
The multi-lingual full text graphical-LCD in connection with the 3 push buttons allows a comfortable and easy local
configuration and operation as well as the display of valve specific data, and status- and diagnostic messages.
Connection and Start-up
Upon connection of supply air and a voltage source of e.g.
DC 24 V to the input terminals (polarity is random, see page
21) an initial start-up can be carried out without any further
With the local push buttons, basic parameters can be changed,
such as type of actuator, side of installation, valve
opens/closes with increasing setpoint value, and characteristics
curve of the valve (values set ex-factory: stroke
actuator, mounting side: left, valve opens with increasing
setpoint value, linear characteristics curve).
Thereafter an AUTOSTART can be performed; during
which the SRD991 determines independently the geometric
data of the actuator as well as control parameters, to
ensure an optimized operation with the attached valve.